diff --git a/frontend/src/lib/prefetchers.ts b/frontend/src/lib/prefetchers.ts
index 56361c7..4461ae7 100644
--- a/frontend/src/lib/prefetchers.ts
+++ b/frontend/src/lib/prefetchers.ts
@@ -61,7 +61,20 @@ const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
   if (version)
     return
 
-  const p = { tags: effectiveTitle, match: 'all', page: 1, limit: 8 } as const
+  const p = {
+      tags: effectiveTitle,
+      match: 'all',
+      page: 1,
+      limit: 8,
+      url: '',
+      title: '',
+      originalCreatedFrom: '',
+      originalCreatedTo: '',
+      createdFrom: '',
+      createdTo: '',
+      updatedFrom: '',
+      updatedTo: '',
+      order: 'original_created_at:desc' } as const
   await qc.prefetchQuery ({
       queryKey: postsKeys.index (p),
       queryFn:  () => fetchPosts (p) })
@@ -70,30 +83,23 @@ const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
 
 const prefetchPostsIndex: Prefetcher = async (qc, url) => {
   const tags = url.searchParams.get ('tags') ?? ''
-  const qURL = url.searchParams.get ('url')
-  const title = url.searchParams.get ('title')
-  const originalCreatedFrom = url.searchParams.get ('original_created_from')
-  const originalCreatedTo = url.searchParams.get ('original_created_to')
-  const createdFrom = url.searchParams.get ('created_from')
-  const createdTo = url.searchParams.get ('created_to')
-  const updatedFrom = url.searchParams.get ('updated_from')
-  const updatedTo = url.searchParams.get ('updated_to')
+  const qURL = url.searchParams.get ('url') ?? ''
+  const title = url.searchParams.get ('title') ?? ''
+  const originalCreatedFrom = url.searchParams.get ('original_created_from') ?? ''
+  const originalCreatedTo = url.searchParams.get ('original_created_to') ?? ''
+  const createdFrom = url.searchParams.get ('created_from') ?? ''
+  const createdTo = url.searchParams.get ('created_to') ?? ''
+  const updatedFrom = url.searchParams.get ('updated_from') ?? ''
+  const updatedTo = url.searchParams.get ('updated_to') ?? ''
   const m: 'all' | 'any' = url.searchParams.get ('match') === 'any' ? 'any' : 'all'
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
-  const order = url.searchParams.get ('order') as FetchPostsOrder | null
+  const order = (url.searchParams.get ('order') ?? 'original_created_at:desc') as FetchPostsOrder
 
   const keys = {
-      tags, match: m, page, limit,
-      ...(qURL && { url: qURL }),
-      ...(title && { title }),
-      ...(originalCreatedFrom && { originalCreatedFrom }),
-      ...(originalCreatedTo && { originalCreatedTo }),
-      ...(createdFrom && { createdFrom }),
-      ...(createdTo && { createdTo }),
-      ...(updatedFrom && { updatedFrom }),
-      ...(updatedTo && { updatedTo }),
-      ...(order && { order }) }
+      tags, match: m, page, limit, url: qURL, title,
+      originalCreatedFrom, originalCreatedTo, createdFrom, createdTo,
+      updatedFrom, updatedTo, order }
 
   await qc.prefetchQuery ({
       queryKey: postsKeys.index (keys),
diff --git a/frontend/src/pages/posts/PostListPage.tsx b/frontend/src/pages/posts/PostListPage.tsx
index 95eca92..70e3e68 100644
--- a/frontend/src/pages/posts/PostListPage.tsx
+++ b/frontend/src/pages/posts/PostListPage.tsx
@@ -35,9 +35,14 @@ export default (() => {
   const page = Number (query.get ('page') ?? 1)
   const limit = Number (query.get ('limit') ?? 20)
 
+  const keys = {
+      tags: tagsKey, match, page, limit,
+      url: '', title: '', originalCreatedFrom: '', originalCreatedTo: '',
+      createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
+      order: 'original_created_at:desc' } as const
   const { data, isLoading: loading } = useQuery ({
-      queryKey: postsKeys.index ({ tags: tagsKey, match, page, limit }),
-      queryFn:  () => fetchPosts ({ tags: tagsKey, match, page, limit }) })
+      queryKey: postsKeys.index (keys),
+      queryFn:  () => fetchPosts (keys) })
   const posts = data?.posts ?? []
   const cursor = ''
   const totalPages = data ? Math.ceil (data.count / limit) : 0
diff --git a/frontend/src/pages/posts/PostSearchPage.tsx b/frontend/src/pages/posts/PostSearchPage.tsx
index e100d5b..727dced 100644
--- a/frontend/src/pages/posts/PostSearchPage.tsx
+++ b/frontend/src/pages/posts/PostSearchPage.tsx
@@ -44,43 +44,43 @@ export default (() => {
   const page = Number (query.get ('page') ?? 1)
   const limit = Number (query.get ('limit') ?? 20)
 
-  const qURL = query.get ('url')
-  const qTitle = query.get ('title')
+  const qURL = query.get ('url') ?? ''
+  const qTitle = query.get ('title') ?? ''
   const qTags = query.get ('tags') ?? ''
   const qMatch: 'all' | 'any' = query.get ('match') === 'any' ? 'any' : 'all'
-  const qOriginalCreatedFrom = query.get ('original_created_from')
-  const qOriginalCreatedTo = query.get ('original_created_to')
-  const qCreatedFrom = query.get ('created_from')
-  const qCreatedTo = query.get ('created_to')
-  const qUpdatedFrom = query.get ('updated_from')
-  const qUpdatedTo = query.get ('updated_to')
+  const qOriginalCreatedFrom = query.get ('original_created_from') ?? ''
+  const qOriginalCreatedTo = query.get ('original_created_to') ?? ''
+  const qCreatedFrom = query.get ('created_from') ?? ''
+  const qCreatedTo = query.get ('created_to') ?? ''
+  const qUpdatedFrom = query.get ('updated_from') ?? ''
+  const qUpdatedTo = query.get ('updated_to') ?? ''
   const order = (query.get ('order') || 'original_created_at:desc') as FetchPostsOrder
 
   const [activeIndex, setActiveIndex] = useState (-1)
-  const [createdFrom, setCreatedFrom] = useState (qCreatedFrom)
-  const [createdTo, setCreatedTo] = useState (qCreatedTo)
-  const [matchType, setMatchType] = useState (qMatch ?? 'all')
-  const [originalCreatedFrom, setOriginalCreatedFrom] = useState (qOriginalCreatedFrom)
-  const [originalCreatedTo, setOriginalCreatedTo] = useState (qOriginalCreatedTo)
+  const [createdFrom, setCreatedFrom] = useState<string | null> (null)
+  const [createdTo, setCreatedTo] = useState<string | null> (null)
+  const [matchType, setMatchType] = useState<'all' | 'any'> ('all')
+  const [originalCreatedFrom, setOriginalCreatedFrom] = useState<string | null> (null)
+  const [originalCreatedTo, setOriginalCreatedTo] = useState<string | null> (null)
   const [suggestions, setSuggestions] = useState<Tag[]> ([])
   const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
-  const [tagsStr, setTagsStr] = useState (qTags)
-  const [title, setTitle] = useState (qTitle ?? '')
-  const [updatedFrom, setUpdatedFrom] = useState (qUpdatedFrom)
-  const [updatedTo, setUpdatedTo] = useState (qUpdatedTo)
-  const [url, setURL] = useState (qURL ?? '')
+  const [tagsStr, setTagsStr] = useState ('')
+  const [title, setTitle] = useState ('')
+  const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
+  const [updatedTo, setUpdatedTo] = useState<string | null> (null)
+  const [url, setURL] = useState ('')
 
   const keys: FetchPostsParams = {
       tags: qTags, match: qMatch, page, limit,
-      ...(qURL && { url: qURL }),
-      ...(qTitle && { title: qTitle }),
-      ...(qOriginalCreatedFrom && { originalCreatedFrom: qOriginalCreatedFrom }),
-      ...(qOriginalCreatedTo && { originalCreatedTo: qOriginalCreatedTo }),
-      ...(qCreatedFrom && { createdFrom: qCreatedFrom }),
-      ...(qCreatedTo && { createdTo: qCreatedTo }),
-      ...(qUpdatedFrom && { updatedFrom: qUpdatedFrom }),
-      ...(qUpdatedTo && { updatedTo: qUpdatedTo }),
-      ...(order && { order }) }
+      url: qURL,
+      title: qTitle,
+      originalCreatedFrom: qOriginalCreatedFrom,
+      originalCreatedTo: qOriginalCreatedTo,
+      createdFrom: qCreatedFrom,
+      createdTo: qCreatedTo,
+      updatedFrom: qUpdatedFrom,
+      updatedTo: qUpdatedTo,
+      order }
   const { data, isLoading: loading } = useQuery ({
       queryKey: postsKeys.index (keys),
       queryFn: () => fetchPosts (keys) })
diff --git a/frontend/src/pages/wiki/WikiDetailPage.tsx b/frontend/src/pages/wiki/WikiDetailPage.tsx
index eeb0b87..fd2c0b5 100644
--- a/frontend/src/pages/wiki/WikiDetailPage.tsx
+++ b/frontend/src/pages/wiki/WikiDetailPage.tsx
@@ -44,10 +44,15 @@ export default () => {
       queryKey: tagsKeys.show (effectiveTitle),
       queryFn:  () => fetchTagByName (effectiveTitle) })
 
+  const keys = {
+      tags: effectiveTitle, match: 'all', page: 1, limit: 8, url: '', title: '',
+      originalCreatedFrom: '', originalCreatedTo: '',
+      createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
+      order: 'original_created_at:desc' } as const
   const { data } = useQuery ({
       enabled:  Boolean (effectiveTitle) && !(version),
-      queryKey: postsKeys.index ({ tags: effectiveTitle, match: 'all', page: 1, limit: 8 }),
-      queryFn:  () => fetchPosts ({ tags: effectiveTitle, match: 'all', page: 1, limit: 8 }) })
+      queryKey: postsKeys.index (keys),
+      queryFn:  () => fetchPosts (keys) })
   const posts = data?.posts || []
 
   useEffect (() => {
diff --git a/frontend/src/types.ts b/frontend/src/types.ts
index 7cecaa2..d7b0afd 100644
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -12,19 +12,19 @@ export type FetchPostsOrder = `${ FetchPostsOrderField }:${ 'asc' | 'desc' }`
 export type FetchPostsOrderField = typeof FETCH_POSTS_ORDER_FIELDS[number]
 
 export type FetchPostsParams = {
-    url?:                 string
-    title?:               string
-    tags?:                string
-    match?:               'all' | 'any'
-    createdFrom?:         string
-    createdTo?:           string
-    updatedFrom?:         string
-    updatedTo?:           string
-    originalCreatedFrom?: string
-    originalCreatedTo?:   string
-    page?:                number
-    limit?:               number
-    order?:               FetchPostsOrder }
+    url:                  string
+    title:                string
+    tags:                 string
+    match:                'all' | 'any'
+    originalCreatedFrom:  string
+    originalCreatedTo:    string
+    createdFrom:          string
+    createdTo:            string
+    updatedFrom:          string
+    updatedTo:            string
+    page:                 number
+    limit:                number
+    order:                FetchPostsOrder }
 
 export type Menu = MenuItem[]